With my 7D I have recently started using the current top of the range Lexar CF cards:Max. Read Speed: 150MB/sWrite Speed: 145MB/sUDMA 7 CompliantAvailable in 32GB, 64GB and 128 GB http://au.lexar.com/node/5175?category=1682

Faster than any other cards I have tried and reliable.

I purchased online from B&H in USA as Australian store prices were significantly higher